Investment casting

a technology of investment casting and casting shell, applied in the direction of climate sustainability, waterborne vessels, machines/engines, etc., can solve the problems of shell and the reticulate core element being destroyed

Active Publication Date: 2006-12-05
RTX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shell and the reticulate core element are destructively removed.

Method used

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Examples

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Embodiment Construction

[0036]FIG. 1 shows a gas turbine engine blade 20 (e.g., from a turbine section of the engine). The blade may comprise a unitarily-formed metallic casting, optionally coated for thermal and / or chemical protection. The general configuration of the exemplary blade 20 is considered merely illustrative. The blade includes an airfoil 22 extending from a root 24 at a platform 26 to a tip 28. The airfoil has pressure and suction side surfaces 30 and 32 extending between leading and trailing edges 34 and 36. A disk attachment portion (e.g., a so-called fir tree blade attachment root) 38 depends from the underside of the platform 26 (e.g., depending / inboard / underside indicating a direction generally toward rather than away from the engine centerline). As thus described, the blade may be of a variety of known or yet-developed general configurations.

[0037]The exemplary blade 20, however, may include one or more of several improvements for encouraging heat transfer and / or controlling weight. FIG...

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Abstract

An article may be manufactured by providing a reticulate core element in a mold shell having a shape at least partially corresponding to a shape of the article. The molten metallic material is introduced to the shell so as to at least partially infiltrate into the reticulate core element. The molten metallic material is permitted to solidify. The shell and the reticulate core element are destructively removed. The removal leaves the article with one or more gas-permeable porous regions.

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to investment casting. More particularly, the invention relates to investment casting of cooled parts.[0002]Investment casting is a commonly used technique for forming metallic components having complex geometries, especially hollow components, and is used in the fabrication of superalloy gas turbine engine components.[0003]Gas turbine engines are widely used in aircraft propulsion, electric power generation, ship propulsion, and pumps. In gas turbine engine applications, efficiency is a prime objective. Improved gas turbine engine efficiency can be obtained by operating at higher temperatures, however current operating temperatures in the turbine section exceed the melting points of the superalloy materials used in turbine components. Consequently, it is a general practice to provide air cooling. Cooling is typically provided by flowing relatively cool air from the compressor section of the engine through passages in the turbin...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F01D5/18F01D5/14
CPCB22C9/04B23P15/04C04B37/005F01D5/147F01D5/183B22C9/10Y10T29/49336C04B2237/04C04B2237/341C04B2237/343C04B2237/346C04B2237/62C04B2237/84C04B2237/86Y02T50/676F01D5/14F01D11/005F01D11/08Y02T50/60B22D23/00B22D19/00
Inventor MARCIN, JR., JOHN J.
Owner RTX CORP
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